A Nashua man was arrested Saturday and accused of threatening and kidnapping his mother.

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Shaun Driscoll, 28, was arrested in Salem and charged with criminal restraint, criminal threatening with a deadly weapon and unauthorized use of a motor vehicle.

Driscoll's 67-year-old mother told police that he attacked her on Friday and threatened her with a knife. She told officers Driscoll locked her in a bathroom at her Nashua home.

The mother said her son later forced her to drive to Lawrence, Mass., to buy heroin and withdraw money from an ATM, police said.

After the trip to Lawrence, they went to a Walmart store in Salem and he told her to stay near or he would kill her with a knife, said police. When he was distracted looking at guns in the store, she escaped and found a store employee, who then called authorities, the mother told police.